<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator=">">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>编辑商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card class="box-card">
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center :closable="false" show-icon></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" @tab-click="tabClicked" :tab-position="'left'" :before-leave="beforeTabsLeave">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类"  prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的 item 项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <!-- 渲染表单的 item 项 -->
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action : 图片要上传到后台的API接口地址 -->
            <!-- on-preview : 预览图片事件 -->
            <!-- list-type="picture" ： 图片呈现的效果：可以纯文件名或者带缩略图形式 -->
            <el-upload :action="uploadURL" :file-list="previewList" :headers="headerObj" :on-success="handleSuccess" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="addInfo">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      // 步骤条默认激活
      activeIndex: '0',
      // form 表单
      addForm: {
        goods_id: '',
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 上传图片的空数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        // 存放商品参数和商品属性的数组
        attrs: []
      },
      // form 表单规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      cateList: [],
      // 级联选择框
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的 headers 请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览地址
      previewPath: '',
      previewVisible: false,
      previewList: []
    }
  },
  created() {
    this.getCateList()
    const goodsId = this.$route.params.goodsId
    // console.log(id)
    this.getGoodsInfo(goodsId)
  },
  methods: {
    // 根据id 查询对应的数据信息
    async getGoodsInfo(goodsId) {
      const { data: res } = await this.$http.get(`goods/${goodsId}`)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      console.log(res.data)
      this.addForm.goods_id = res.data.goods_id
      this.addForm.attrs = res.data.attrs
      this.addForm.goods_name = res.data.goods_name
      this.addForm.goods_price = res.data.goods_price
      this.addForm.goods_weight = res.data.goods_weight
      this.addForm.goods_number = res.data.goods_number
      // 商品所属的分类数组
      this.addForm.goods_cat = res.data.goods_cat.split(',').map(Number)
      // 上传图片的空数组
      const picInfo = {
        pic: res.data.pics[0].pics_sma_url
      }
      this.addForm.pics.push(picInfo)
      const picUrl = {
        name: res.data.pics[0].pics_sma.split('/')[3],
        url: res.data.pics[0].pics_sma_url
      }
      this.previewList.push(picUrl)
      this.previewPath = res.data.pics[0].pics_mid_url
      // 商品的详情描述
      this.addForm.goods_introduce = res.data.goods_introduce
      console.log(this.addForm)
    },
    // 商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.cateList = res.data
    },
    // 级联选择器选中项变化，会触发的函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
      console.log(this.addForm.goods_cat)
    },
    // tab 标签切换时触发的函数
    beforeTabsLeave(activeName, oldActiveName) {
      // console.log('新：' + activeName)
      // console.log('旧：' + oldActiveName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // tab 标签的点击事件
    async tabClicked() {
      // 动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'many'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        // console.log(res.data)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'only'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        this.onlyTableData = res.data
        // console.log(res.data)
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      // console.log(file)
      if (file.response !== undefined) {
        this.previewPath = file.response.data.url
      } else {
        this.previewPath = file.url
      }
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file, fileList) {
      // console.log(file)
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从 pic 数组中，找到对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的 splice 方法，把图片信息对象从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
      // console.log(this.addForm)
    },
    // 监听图片上传成功事件
    handleSuccess(response, file, fileList) {
      // console.log(response)
      // 1.拼接得到一个图片信息
      const picInfo = {
        pic: response.data.tmp_path
      }
      // 2.将图片信息对象 push 到 pics 数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm)
    },
    addInfo() {
      // console.log(this.addForm)
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 添加的业务逻辑
        // lodash cloneDeep(obj) : 深拷贝
        const form = _.cloneDeep(this.addForm)
        // 处理 商品分类数据 ： arr => str
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数和静态属性 数据
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        // 把处理过的数据 赋值给 form
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求
        // 商品名称必须是唯一的
        const { data: res } = await this.$http.put(`goods/${this.addForm.goods_id}`, form)
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        this.$router.push('/goods')
      })
    }
  },
  // 计算属性
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>
